Has anyone else struggled with run2 week4? I found it sooo hard last night as it was really warm despite us going out at 7.30. Legs were like lead but had been sat behind a desk all day and wearing really flat sandals with no support so wonder if that contributed to it. I came home soaked in sweat and looking like a beetroot and also took a while to recover also despite having lots of water. Knocked me back a little.